The Restless Door, a powerful artifact with the ability to create portals to any dimension, has fallen into the hands of the Mistress, the Sculptor, and the Soul Glutton. While the trio of Big Bads is opening portals around the globe, bringing dangerous demons to Earth, Buffy and the Scoobies are struggling to fight this demon world war. They are also struggling to get along and disagreeing about how to solve the problem. Their paths are diverging, which, for Buffy, feels a lot like betrayal. Are they growing apart... or simply growing up?